import os
import site
import sys
from distutils.sysconfig import get_python_lib

from setuptools import setup

# Allow editable install into user site directory.
# See https://github.com/pypa/pip/issues/7953.
site.ENABLE_USER_SITE = "--user" in sys.argv[1:]

overlay_warning = False
if "install" in sys.argv:
    lib_paths = [get_python_lib()]
    if lib_paths[0].startswith("/usr/lib/"):
        # We have to try also with an explicit prefix of /usr/local in order to
        # catch Debian's custom user site-packages directory.
        lib_paths.append(get_python_lib(prefix="/usr/local"))
    for lib_path in lib_paths:
        existing_path = os.path.abspath(os.path.join(lib_path, "djcompiler"))
        if os.path.exists(existing_path):
            # We note the need for the warning here, but present it after the
            # command is run, so it's more likely to be seen.
            overlay_warning = True
            break

setup()

if overlay_warning:
    sys.stderr.write(
        """
========
WARNING!
========
You have just installed djcompiler over top of an existing
installation, without removing it first. Because of this,
your install may now include extraneous files from a
previous version that have since been removed from
Django. This is known to cause a variety of problems. You
should manually remove the
%(existing_path)s
directory and re-install djcompiler.
"""
        % {"existing_path": existing_path}
    )
